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Document type:
journal article 
Author(s):
HANISCH, T; KLEINE, B; RITZL, A; MULLERHARTMANN, E 
Title:
FERROMAGNETISM IN THE HUBBARD-MODEL - INSTABILITY OF THE NAGAOKA STATE ON THE TRIANGULAR, HONEYCOMB AND KAGOME LATTICES 
Abstract:
In order to analyse the lattice dependence of ferromagnetism in the two-dimensional Hubbard model we investigate the instability of the fully polarised ferromagnetic ground state (Nagaoka state) on the triangular, honeycomb and kagome lattices. We mainly focus on the local instability applying single spin flip variational wave functions which include majority spin correlation effects. The question of global instability and phase separation is addressed in the framework of Hartree-Fock theory. We...    »
 
Journal title abbreviation:
Ann Phys -Leip 
Year:
1995 
Journal volume:
Journal issue:
Pages contribution:
303-328 
Language:
eng 
Print-ISSN:
0003-3804 
TUM Institution:
Abteilung für Neuroradiologie